Remove skipping of Reshape from NNAPI EP (#19618)
### Description
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A number of Qualcomm Snapdragon chipsets do not produce correct output
if we skip the Reshape, which ironically was a performance optimization
for Snapdragon chips.
Perf testing showed that Squeeze also seems to execute on CPU so there's
no benefit to using that as an alternative where possible e.g.
Global*Pool -> Reshape to 2D -> Gemm could be potentially be replaced
with Global*Pool -> Squeeze dims 2 and 3 -> Gemm if that offered better
performance.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
#19518
